I'm pretty sure dbPowerAmp works for me doing this.
I started using TLH to convert everything just to keep the number of programs I use to a minimum. Now when I'm done tracking out a show I convert the 24bit WAV's to 16/44.1, then I convert both of those to FLAC, and finally I convert the 16bit FLAC to V0 MP3. When I'm done with all of that I dump all 3 filesets into Foobar and use the Live Show Tagger to tag them all at once.
If you're taking previously made FLAC's and converting them to MP3, I'm pretty sure dbPowerAmp is your answer. Worse comes to worse you can dump the TXT file from the FLAC's into the MP3 file folder and retag in Foobar.